GNU Recutils

https://www.gnu.org/software/recutils
GNU Recutils is a set of tools and libraries to access human-editable text-based databases called recfiles. The GNU recutils suite comprises a Texinfo manual describing the rec format, a C library (librec) providing a rich set of functions to access rec files, a set of C utilities (recinf, recsel, recins, recset and recfix) that can be used in shell scripts, and an Emacs mode (rec-mode).

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